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The Periodic Table of Elements

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Astatine

Isotopes of the Element Polonium

[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
186No Data AvailableNo Data AvailableNo Data Available
1871.40 millisecondsAlpha Decay100.00%
1880.275 millisecondsElectron Capture100.00%
Alpha DecayNo Data Available
1893.5 millisecondsAlpha Decay100.00%
1902.46 millisecondsAlpha Decay100.00%
19122 millisecondsAlpha Decay99.00%
191m93 millisecondsAlpha Decay96.00%
19232.2 millisecondsAlpha Decay~ 99.50%
Electron Capture~ 0.50%
193245 millisecondsAlpha Decay<= 100.00%
193m370 millisecondsAlpha Decay<= 100.00%
1940.392 secondsAlpha Decay100.00%
Electron CaptureNo Data Available
1954.64 secondsAlpha Decay75.00%
Electron Capture25.00%
195m1.92 secondsElectron Capture~ 10.00%
Isomeric Transition< 0.01%
Alpha Decay~ 90.00%
1965.8 secondsAlpha Decay~ 98.00%
Electron Capture~ 2.00%
19784 secondsElectron Capture56.00%
Alpha Decay44.00%
197m32 secondsAlpha Decay84.00%
Electron Capture16.00%
Isomeric Transition0.01%
1981.77 minutesAlpha Decay57.00%
Electron Capture43.00%
1995.47 minutesElectron Capture92.50%
Alpha Decay7.50%
199m4.17 minutesElectron Capture73.50%
Alpha Decay24.00%
Isomeric Transition2.50%
20011.51 minutesElectron Capture88.90%
Alpha Decay11.10%
20115.6 minutesElectron Capture98.87%
Alpha Decay1.13%
201m8.96 minutesElectron Capture41.40%
Alpha Decay2.40%
Isomeric Transition56.20%
20244.6 minutesElectron Capture98.08%
Alpha Decay1.92%
20336.7 minutesElectron Capture99.89%
Alpha Decay0.11%
203m45 secondsIsomeric Transition100.00%
Electron CaptureNo Data Available
2043.519 hoursElectron Capture99.33%
Alpha Decay0.67%
2051.74 hoursAlpha Decay0.04%
Electron Capture99.96%
205m0.645 millisecondsIsomeric Transition100.00%
205m157.4 millisecondsIsomeric Transition100.00%
2068.8 daysElectron Capture94.55%
Alpha Decay5.45%
2075.80 hoursElectron Capture99.98%
Alpha Decay0.02%
207m2.79 secondsIsomeric Transition100.00%
2082.898 yearsAlpha Decay100.00%
Electron Capture4.0×10-3 %
209102 yearsElectron Capture0.48%
Alpha Decay99.52%
210138.376 daysAlpha Decay100.00%
2110.516 secondsAlpha Decay100.00%
211m25.2 secondsAlpha Decay99.98%
Isomeric Transition0.02%
2120.299 microsecondsAlpha Decay100.00%
212m45.1 secondsAlpha Decay99.93%
Isomeric Transition0.07%
2133.72 microsecondsAlpha Decay100.00%
214164.3 microsecondsAlpha Decay100.00%
2151.781 millisecondsAlpha Decay100.00%
Beta-minus Decay2.3×10-4 %
2160.145 secondsAlpha Decay100.00%
2171.53 secondsAlpha DecayNo Data Available
2183.098 minutesAlpha Decay99.98%
Beta-minus Decay0.02%
219> 300 nanosecondsBeta-minus DecayNo Data Available
220> 300 nanosecondsBeta-minus DecayNo Data Available
221112 secondsBeta-minus Decay (suspected)No Data Available
222550 secondsBeta-minus Decay (suspected)No Data Available
223> 300 nanosecondsBeta-minus DecayNo Data Available
224> 300 nanosecondsBeta-minus DecayNo Data Available
225> 300 nanosecondsBeta-minus DecayNo Data Available
226> 300 nanosecondsBeta-minus DecayNo Data Available
227> 300 nanosecondsBeta-minus DecayNo Data Available